Latitude (degrees, minutes, and seconds) ...... 461910 Longitude (degrees, minutes, and seconds) ..... 1225427* State Code .................................... 53 County Code ................................... 015 County Name ................................... Cowlitz Basin Name .................................... Lower Cowlitz Hydrologic Unit Code .......................... 17080005 Drainage Area (square miles) .................. 512.0** Gage Datum (feet, 1929 NGVD) .................. 37.88 Location ...................... NE/SE, sec.27, T.10 N, R.2 W, on right bank at Old U.S.Highway 99 bridge, 3.0 mi north of Castle Rock, and at mile 1.0. ----Period(s) of Record---- Surface-Water Discharge or Stage-Only: 1980-82 Surface-Water Quality: 1980-82 * also published as longitude: 1225428 ** 1) Approximately 21 sq.mi. is noncontributing. Prior to July 7, 1981, approximately 40 sq.mi. was noncontributing. 2) USGS Surface Water Data Retrieval Program lists as 511.0 square miles
Dinehart, Randy L., Ritter, John R., and Knott, James M., 1981, Sediment Data for Streams near Mount St. Helens, Washington, Volume 1, 1980 Water-Year: U.S. Geological Survey Open-File Report 81-822. Dinehart, Randy L., 1986, Sediment Data For Streams Near Mount St. Helens, Washington, Volume 2, Water Years 1981-83: U.S. Geological Survey Open-File Report 85-632. Dinehart, Randy, 1987, Vertical Profiles of Velocity and Suspended Sediment in Streams Near Mount St. Helens, Washington: U.S. Geological Survey Open-File Report 87-377. Meyer, D.F., Nolan, K.M., and Dodge, J.E., 1986, Post-Eruption Changes in Channel Geometry of Streams in the Toutle River Drainage Basin, 1980-82, Mount St. Helens, Washington: U.S. Geological Survey Open-File Report 85-412.